如何填充此PHP數組？

Question

我具有由外包數據：

http://example.com/data/news.json

這裏是例如解碼後的結果是：

Array 
(
    [popular] => Array 
     (
      [last_week] => Array 
       (
        [0] => Array 
         (
          [title] => Business 1 
          [category] => blog/business/local 
         ) 
        [1] => Array 
         (
         [title] => Health 1 
         [category] => blog/health/skincare 
        ) 
       [2] => Array 
        (
         [title] => Business 2 
         [category] => blog/business/local 
        ) 
       [3] => Array 
        (
         [title] => Health 2 
         [category] => blog/health/skincare 
        ) 
      ) 
    ) 

) 

我使用下面的方法來顯示它：

$url = 'http://example.com/data/news.json'; 
$json = file_get_contents($url); 
if(!empty($json)) { 
$json_data = json_decode($json, true); 
$popular_last_week = $json_data['popular']['last_week']; 
$count = count($popular_last_week); 
$result .= $count.' last week popular article' . "\n"; 
for ($i = 0; $i <$count; $i++) { 
$result .= 'Title : '.$popular_last_week[$i]['title'] . "\n"; 
$result .= 'Category : '.$popular_last_week[$i]['category'] . "\n\n"; 
} 
echo $result; 
} 

輸出數據爲：

篇上週4流行的文章

標題：商務1
類別：博客/業務/本地

標題：生1
類別：博客/保健/護膚

標題：Business 2
類別：博客/業務/本地

標題：生2
類別：博客/保健/護膚

的問題是如何顯示輸出爲以下幾點：

2上週熱門商業用品

標題：Business 1
類別：商業營業

標題：企業2
分類：商業

上週2流行健康文章

標題：生1
範疇：健康

標題：生2
分類：健康

幫助將不勝感激！謝謝。

Answer 1

你的意思是說你只想顯示2項？您需要使用for循環。

for ($i = 0; $i < 2; $i++) { 
    # display for $i 
} 

更新：

嗯，我想我明白。你應該通過兩次使用foreach環路和環路：

$categoryItems = array(); 
foreach ($popular_last_week as $item) { 
    $categoryItems[$item['category']][] = $item['title']; 
} 
foreach ($categoryItems as $category => $items) { 
    $result .= count($items) . ' popular in category ' . $category; 
    foreach ($items as $item){ 
        $result .= 'Title: ' . $item['title'] . "\n"; 
    } 
} 
echo $result; 

Answer 2

$url = 'http://example.com/data/news.json'; 
$json = file_get_contents($url); 
if(!empty($json)) { 
    $json_data = json_decode($json, true); 
    $popular_last_week = $json_data['popular']['last_week']; 

    // This loop will group all entries by category. 
    $categories = array(); 
    foreach ($popular_last_week as $item) { 
     $categories[$item['category']][] = $item['title']; 
    } 

    // This loop will echo the titles grouped by categories. 
    foreach ($categories as $category => $titles) { 
     $result = count($titles) . ' popular in "' . $category . '"' . "\n"; 
     foreach ($titles as $title) { 
      $result .= 'Title: ' . $title . "\n"; 
     } 
     echo $result; 
    } 
}